JP2513468Y2 - Valve cotter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve cotter interposed between a valve stem of an engine and a spring retainer.

[0002]

2. Description of the Related Art FIG. 4 shows a valve cotter in which a spring retainer is assembled to a valve stem, and a valve 1 is normally urged in a valve closing direction by a valve spring 3 which is compressed between a cylinder head and a spring retainer 2. It Spring retainer 2 and valve stem 1 of valve 1
a is assembled through the valve cotter 4,
As the valve cotter 4, a two-piece type having two retainer locks 4A and 4B made of forged steel is conventionally used.

This valve cotter 4 is assembled as follows when assembling around the spring retainer 2. First,
As shown in FIG. 5, the spring retainer 2 is pushed against the spring force of the valve spring 3 to form a gap between the spring retainer 2 and the valve stem 1a. Then, two retainer locks 4A and 4B are respectively inserted into the gaps from the left and right sides, each lower end 4b is fitted into the tapered fitting hole 2a of the spring retainer 2, and each upper end 4a is fitted into the cotter groove 1b of the valve stem 1a. To fit.
Next, when the spring retainer 2 is returned by the spring force of the valve spring 3, each retainer lock 4A, 4B becomes
The spring retainer 2 is assembled between the tapered fitting hole 2a and the valve stem 1a (FIG. 4).

[0004]

By the way, in the above-mentioned valve cotter 4, the retainer locks 4A and 4B divided into two small parts are separately inserted into the gap between the spring retainer 2 and the valve stem 1a. However, there is a drawback in that it is difficult to handle, and thus there is a problem in that workability during assembly around the spring retainer 2 is impaired. Further, since it is a forged steel product, it is heavy, and weight reduction is desired in order to improve the performance of the valve train.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a valve cotter which is lightweight and can be incorporated with one touch.

[0006]

In order to achieve the above object, according to the present invention, a valve cotter for engaging a spring retainer with a valve stem is integrally formed by a resin member, and the valve cotter is axially formed from an upper end surface thereof. A plurality of slits having a predetermined length are provided, and the fitting portion that fits into the cotter groove of the valve stem can be expanded in diameter.

[0007]

The resin valve cotter whose fitting portion is divided such that the diameter can be expanded is fitted into the valve stem with one touch by utilizing the elasticity of the resin, and is incorporated between the valve stem and the spring retainer. As a result, the valve cotter can be easily assembled, and the workability of assembling around the spring retainer is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The same parts as those in FIGS. 4 and 5 are designated by the same reference numerals in the following description. FIG. 1 shows a valve cotter according to the present invention, in which a valve cotter 5 is integrally formed of a resin member, and is fitted into a tapered fitting hole 2a of a spring retainer 2 and fitted onto a valve stem 1a of a valve 1. It has a possible shape. That is, the outer peripheral surface 5c of the valve cotter 5 is circular and has a narrow taper downward (FIG. 3). Further, the inner peripheral surface 5d of the valve cotter 5 has a circular shape into which the valve stem 1a can be fitted, and the upper portion of the inner peripheral surface 5d is for fitting and locking in the cotter groove 1b of the valve stem 1a. A fitting portion 5e that bulges like a chin is formed.

As shown in FIG. 1, the valve cotter 5 is vertically divided into a plurality of, for example, 8 pieces from the upper end surface 5a where the fitting portion 5e is formed, along the axial direction. A plurality of slits 6 that radially form individual wedge-shaped retainer locks 5A to 5H (FIG. 2) are provided. The lower end 5b of the valve cotter 5 is connected to the lower ends of the retainer locks 5A to 5H, and the fitting portion 5e of the retainer locks 5A to 5H can be expanded by the elasticity of the resin.

The valve cotter 5 is made of, for example, a phenolic resin having a high hardness, and the lower end 5b connecting the retainer locks 5A to 5H is partially softened and modified to have elasticity. There is. The operation will be described below. When assembling around the spring retainer 2, the spring retainer 2 is pushed in against the spring force of the valve spring 3 so that the tip of the valve stem 1 a projects from the spring retainer 2. Then, when the valve cotter 5 is fitted to the tip of the valve stem 1a and the retainer locks 5A to 5H are fitted to the valve stem 1a,
The fitting portions 5e formed on the upper portions of the retainer locks 5A to 5H are fitted into the cotter grooves 1b of the valve stem 1a, and the retainer locks 5A to 5H are attached to the valve stem 1.
The valve cotter 5 is radially locked along the outer peripheral edge of a.
Is assembled to the valve stem 1a with one touch. Here, when the spring retainer 2 is returned by the spring force of the valve spring 3 by releasing the pressing force of the spring retainer 2, the retainer locks 5A to 5H are tapered fitting holes 2a.
Fit in the spring retainer 2 and valve stem 1
The spring retainer 2 is assembled between the valve retainer 2 and a, and is attached to the valve stem 1a via the valve cotter 5.

Since the retainer locks 5A to 5H are made of resin having high hardness even when pressed between the spring retainer 2 and the valve stem 1a, they can withstand the pressing force. Further, since the valve cotter 5 is made of a resin member, the weight can be reduced and the kinetic performance of the valve train can be improved. Further, in the above-described embodiment, the valve cotter 5 is divided so as to form the eight retainer locks 5A to 5H, but the number is not limited to this and may be divided into an appropriate number.

[0012]

As described above, according to the present invention, a valve cotter for locking a spring retainer is integrally formed on a valve stem by a resin member, and a slit having a predetermined length from the upper end surface along the axial direction. Since multiple valves are provided and the diameter of the fitting part that fits in the cotter groove of the valve stem can be expanded, the valve cotter can be assembled with one touch between the spring retainer and the valve stem by using the elasticity of resin. it can. As a result, the assembly around the spring retainer can be performed easily and reliably, and the assembly around the spring retainer can be automated.
Further, since the valve cotter is made of resin, the weight can be reduced, and the kinetic performance of the valve train can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a valve cotter according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view around a spring retainer using a conventional valve cotter.

FIG. 5 is a perspective view showing a method of mounting the valve cotter shown in FIG.

[Explanation of symbols]

 1a Valve stem 2 Spring retainer 5 Valve cotter 5A-5H Retainer lock 6 Slit

Claims (1)

(57) [Scope of utility model registration request] 1. A valve cotter that locks a spring retainer on a valve stem is integrally formed of a resin member, and a plurality of slits of a predetermined length are provided axially from an upper end surface of the valve cotter. A valve cotter characterized in that the fitting portion to be fitted can be expanded in diameter.